Abcam Ad

Author Topic: CD31(PECAM-1) Immunofluorescence Method for Paraffin Section  (Read 7498 times)

0 Members and 1 Guest are viewing this topic.

Offline ihcwor2

  • Administrator
  • GoldMember
  • *****
  • Posts: 335
CD31(PECAM-1) Immunofluorescence Method for Paraffin Section
« on: March 15, 2003, 01:50:20 AM »
CD31 (PECAM-1) Immunofluorescence Staining Protocol for Paraffin Sections

Solutions and Reagents

A.   10X Phosphate Buffered Saline (PBS):
To prepare 1 liter,
Na2HPO4 ------------------ 10.9 g
NaH2PO4 ------------------ 3.2 g
NaCl ------------------------ 90 g
Distilled water ----------- 1000 ml
Mix to dissolve and adjust pH to 7.4

B.   Antigen Retrieval Solution:
      Pronase Stock Solution (1% pronase in PBS):
Pronase ------------------------- 100 mg
             PBS ------------------------------- 10 ml
             Mix to dissolve. Aliquot and store at – 20 C

             Pronase Working Solution (0.1% in PBS):
Pronase Stock Solution (1%) --------- 1 ml
PBS ----------------------------------------- 10 ml

C.   Blocking Solution:
2% Normal Rabbit Serum in PBS:
To prepare 100 ml
Normal rabbit serum ------- 2 ml
PBS ---------------------------- 100 ml
Mix to dissolve.

D.   Primary Antibody:
Rat anti-mouse CD31 (PECAM-1) (PharMingen Cat# 553370). Optimal dilution 1:100 in PBS.

E.   Secondary Antibody:
      Rabbit anti-rat IgG (H+L), biotinylated (Vector Laboratories, Cat# BA-4000). Optimal dilution 1:400.

F.   FITC-Streptavidin Reagent:
Vector Laboratories, Cat# SA-5001. Optimal dilution 1:50 in PBS.

G.   PI Stock Solution (1mg/ml or 1.5 mM):
To prepare, add 1 mg PI (Propidium Iodide) to 1 ml distilled water. Store stock solution at 4 C (or aliquot and store at –20 C), protected from light.  When handled properly, solutions are stable for at least six month.

H.   RNase A Stock Solution (1mg/ml):
To prepare, add 1 mg RNase A to 1 ml distilled water. Aliquot and store at –20 C freezer.

I.   PI Working Solution (1 ug/ml PI and 10 ug/ml RNase A in PBS):
To prepare, add 2 ul PI Stock Solution and 20 ul RNase A Stock Solution to 2 ml PBS.


1.   Deparaffinize sections in xylene for 3x5min.
2.   Hydrate with 100% ethanol for 2x5min.
3.   Hydrate with 95% ethanol for 2x5min.
4.   Rinse in distilled water.

5.   Antigen Retrieval: Use pronase or trypsin pretreatment antigen retrieval method.
6.   Rinse sections in PBS for 1x5min.

7.   Blocking: incubate sections with 2% normal rabbit serum in PBS for 20 minutes
8.   Rinse in PBS for 1x2min.

9.   Primary antibody: incubate sections with rat anti-mouse CD31 diluted 1:100 in PBS for 1 hour at room temperature or overnight at 4 C.
10.   Rinse in PBS 3x5 min.

11.   Secondary antibody: incubate sections with biotinylated rabbit anti-rat IgG diluted 1:400 in PBS for 30 minutes at room temperature.
12.   Rinse in PBS for 3x5min.

13.   Incubate sections in FITC-streptavidin for 30 minutes, protecting the slide from light.
14.   Rinse 3x5min in PBS.

15.   Counterstain with PI Working Solution for 20 minutes at 37 C.
16.   Rinse 3x5min in PBS.

17.   Coverslip with aqueous mounting medium and seal with nail polish.

18.   Observation using a fluorescence microscope with appropriate filters. Store slides in the dark at 4 C.


1. Staining pattern -------------------------------endothelial cells
2. CD31 positive sites --------------------------- green
3. Nuclei ------------------------------------------ red

Notes: Use Z-fix will produce superior results.

CD31(PECAM-1) Immunofluorescence Method for Paraffin Section
« on: March 15, 2003, 01:50:20 AM »